The employment of quartz glasses for dosimetry of ionizing radiation

Gulamova, R. R.; Gasanov, É. M.; Sazonova, E. V.; Alimov, R.

doi:10.1016/0168-583x(94)00418-8

Cited by 7 publications

(6 citation statements)

References 4 publications

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The characteristics of quartz glass for separate dosimetry of γ radiation from a VVR-SM reactor in the presence and absence of neutron fluxes are investigated. Consequently, the band at 215 nm may be better as the working band because it is related with the formation of oxygen vacancies (structural defects designated in the literature as E 1 ′-centers) and has a wider dose range [4][5][6][7]. The dosimetric bands are stable with respect to light and temperatures up to 400°C.

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mentioning

confidence: 99%

“…A simple proportion was used to estimate the dose rate of γ radiation from the stopped reactor as ~15 Gy/sec (correspondingly, the current of the ionization chamber was 10 nA). Irradiation with γ rays for 30 h produces photoluminescence bands at 400 and 500 nm, associated with oxygen-deficient centers, and the band 630 nm, which is due to nonbridge oxygen [5]. 2).…”

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confidence: 99%

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Reactor radiation dosimetry using fused quartz

2006

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The characteristics of quartz glass for separate dosimetry of γ radiation from a VVR-SM reactor in the presence and absence of neutron fluxes are investigated. Comparing the absorption and photoluminescence spectra of samples irradiated with γ rays from a stopped reactor and mixed with neutron and γ radiation from an operating reactor shows that in both cases oxygen defects are produced and the dose dependences are linear. The dosimetric bands are stable with respect to light and temperatures up to 400°C. The stationary γ-ray flux from the reactor, after the reactor is stopped, is calibrated according to a known source of γ-ray source 60 Co and is ~15 Gy/sec.Radiation-induced formation of defects in oxides is a serious problem for disposal of radioactive wastes by methods of vitrification and cementation. The combined effect of neutron and γ radiation on oxides has been investigated in detail, and it has been believed that neutrons with energy >100 keV are capable of displacing atoms and the γ component gives rise only to ionization heating of materials and electron transfer between atoms. However, even back in 1973, it was shown [1] that average Compton-electron energy E av = 5E g = 40-45 eV is sufficient to produce one electron-hole pair in a SiO 2 lattice with gap width E g = 8-9 eV. Then the concentration of optical centers produced by γ radiation is related to dose by the empirical relation N(cm -3 ) ≈ 10 10 D γ (Gy). It has been proved experimentally that 60 Co γ rays with E~ 1.25 MeV can shift light anions (O, F) in crystals and glasses by an inelastic mechanism.In a certain interval, the concentration of radiation-induced optical centers in an oxygen sublattice is proportional to the absorbed energy. Consequently, the intensity of the corresponding optical absorption band or photoluminescence can be used as a dosimetric parameter if the optical sensors are stable with respect to the effect of light and temperature (up to 400°C) and also do not overlap in spectra with other centers and do not convert into other centers. For such requirements, the material must be either free of impurities down to 10 -4 % or contain only one optically active impurity, the change of whose valence can be used to determine the absorbed dose of ionizing radiation. In addition, it is desirable that high-temperature annealing of irradiated samples would restore the initial optical spectra and the material can be fused repeatedly. Such a material turned out to be germanium-doped SiO 2 glass, which is applicable as a solid dosimeter for determining the absorbed dose of neutron and γ radiation [2].Investigations [3] have shown that most quartz glasses acquire color under the action of 60 Co γ radiation. This can be used in dosimetry. The intensity of the optical absorption at wavelength λ = 550 nm increases almost linearly with increasing absorbed dose of γ radiation up to dose 10 5 Gy, which attests to the possibility of using KI quartz glass for γ-radiation dosimetry. However, KGS and KSIII glasses acquire almost no color and rema...

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confidence: 99%

Reactor radiation dosimetry using fused quartz

2006

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“…Chaudhuri and Radhaballah [20] have earlier reported the generation of aluminium hole centres in silica glass through irradiation. Gulamova et al [13] have reported the presence of an 'AlO 4 ' hole centre formed under irradiation from its precursor the 'AlO 4 Na' centre as an electron is released and an alkaline ion migrates away. Similarly here in the present glassy materials, there might be a formation of aluminium hole centres originating from'AlO 4 Na' centres.…”

Section: Discussionmentioning

confidence: 99%

“…The phenomenon of TL is also found in quartz and silica glasses. A number of workers have reported on the existence of TL and the associated mechanism in these materials [3][4][5][6][7][8][9][10][11][12][13]. From the application point of few, there are several advantages in using glass materials in dosimetry of ionizing radiations.…”

Section: Introductionmentioning

confidence: 99%

Thermoluminescence of silica-based materials irradiated by thermal neutrons

Lochab¹,

Salah²,

Sandhu³

et al. 2008

J. Phys. D: Appl. Phys.

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This work describes the thermoluminescence (TL) response of silica-based materials irradiated with thermal neutrons. These materials have the compositions (mol %) (60 + x)SiO2–(30 − x)Na2O–5MgO–5Al2O3, where x = 0, 5, 10 and 15. The irradiation was carried out in the fluence range 1 × 1014 – 1 × 1017 neutron cm−2. These glassy materials gave two TL glow peaks at around 473 and 643 K. The intensity ratio of these peaks is found to vary with varying SiO2/Na2O ratios. The peak at 473 K is more prominent at the ratio SiO2/Na2O = 75/15, while the intensity of the other one at 643 K increases by decreasing the value of this ratio. The former peak is attributed to both ‘AlO4’ hole centres and non-bridging oxygen (NBO) ion centres induced by neutrons irradiation, while the latter one could be ascribed to (NBO) ion centres introduced by the network modifiers, Na+ ions. The TL response against the neutron beam fluences of the material having the ratio SiO2/Na2O = 75/15 is found to show sublinearity in the above-mentioned range of fluence (using the area under the curve method). The other features such as high sensitivity and simple glow curve structure might be good indicators for this material to be used as a dosimeter in several applications such as thermal neutrons or in food irradiation.

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“…Irradiation with different dose rates was carried out by changing the distance between the OF and the -radiation source at the levels where dose rates were preliminary determined using KI silica glass. 4) The accumulation of the necessary dose was conducted at the dose rate of 360 R/s, and the measurements of GLE spectra were carried out at different dose rates and doses.…”

Section: Methodsmentioning

confidence: 99%

Influence of γ-Radiation Dose Growth and Dose Rates on Luminescence Properties of Pure Silica Core Fibers with High-OH Group Content

Ashurov

Baydjanov

Gasanov

et al. 2011

Jpn. J. Appl. Phys.

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Luminescence properties of pure silica core optical fibers (OFs) with a high-OH group content are studied in the visible region at different doses and dose rates of 60Co γ-radiation. It is shown that the γ-induced light emission (GLE) spectra consist of Cherenkov emission along the luminescence bands. Different increase rates of the luminescence bands at 450 and 650 nm and the absorption band at 610 nm with increasing γ-radiation dose are observed. The 450 nm luminescence band is caused by the recombination of holes with the trapped electrons of E'-centers. The dose dependence of the 650 nm luminescence band, caused by the nonbridging oxygen hole center (NBOHC), does not coincide with that of the 610 nm absorption band related to this center. It is shown that a considerable part of NBOHC participates in nonradiative relaxation. Also, there is an absorption band caused by color centers different from NBOHC, that contributes to the formation of the 610 nm absorption band. A linear dependence of GLE intensity (at wavelengths of 450 and 650 nm) on the dose rate increase is observed. Such a dependence is caused by a substantial increase in the Cherenkov emission intensity and comparatively small increases in luminescence band intensities at 450 and 650 nm.

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The employment of quartz glasses for dosimetry of ionizing radiation

Cited by 7 publications

References 4 publications

Reactor radiation dosimetry using fused quartz

Reactor radiation dosimetry using fused quartz

Thermoluminescence of silica-based materials irradiated by thermal neutrons

Influence of γ-Radiation Dose Growth and Dose Rates on Luminescence Properties of Pure Silica Core Fibers with High-OH Group Content

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